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How to install wireless card in an old Laptop motherboard
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Below is motherboard that needs a wifi card. There are 125 pins on the motherboard in two pairs. 250 pins !
First solder the new slot in place.
Image below shows a soldered slot in place.
Now we just need a wifi card.
Ok the card is in place now this old laptop is wireless.
How to remove tiny capacitor from Laptop motherboard.
The capacitor is removed and placed on the two penny piece.
Then replace the bad capacitor with a new capacitor and solder it to the laptop motherboard.
The new capacitor is soldered to the laptop motherboard.
NVIDIA GPU REBALL PROCESS
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This is the Hp Dv 6000 with blank screen display
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White vertical lines on the screen ------
This is the Nvidia gpu chip on the motherboard
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You must sprade flux around the eage of the chip
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Now position on the reball machine for chip removal
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The chip has be removed from the motherboard
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Clean and add the new balls to the chip
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Send the chip back to the reball machine for re-soldering
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Allow the motherboard to cool down before turning it on
Operation Completed Successfully
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How to Fix Your Motherboard for $15
When a Motherboard Fails Capacitors - Mysterious Creatures When Capacitors Spring Leaks How To Recognize Flawed Capacitors How To Buy Substitute Low-ESR Capacitors Let's Get Started! Derilling Motherboard De-Soldering Capacitors No Pain, No Gain...? Equip Your Motherboard With New Capacitors Testing
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Component Level Motherboard Repair (Not replacement)
1) How do you diagnose the exact component failure?
Obviously, a burn mark is a dead give away, but what if there are no visual signs? Do you poke around with a multi-meter? With what voltage settings and how do you know what to look for?
2) Is it usually a bad capacitor?
badcaps seems to think so. What about a bad connection?
3) How do you perform the component level repair?
So you've found the bad capacitor or component, can you really solder a new one on without hurting the components around them? What's a good soldering iron for under $100?
Answers to your questions
Diagnose problem:
This is the hardest part in notebook repair. Basically, we measure voltages on motherboard and there are few power supply range from 1V to 12V on the motherboard. For example, north bridge needs 1.05V, 1.2V, 1.5V, 1.8V, 2.5V, depends on model of north bridge.
We also measure all sort of signals, such as PCIRST, CPURST, CLK. We measure the resistances of each AD line from north bridge to CPU/RAM.
We watch the current changing patterns to get rough idea where is the problem.
There are some simple steps to follow when checking a notbook motherboard:
1. make sure main system powers are ready, that is 3V and 5V.
2. switching circuit is ok, which involes IO/Keyboard controler, south bridge
3. power sequence is ok, which you can see the current jump up and down for few times.
4. all the necessary signals are not missing.
About Bad Cap
It happens but only about 10% in those motherboards need to repair, and it is the easiest fault to repair not matter if the cap was burnt or not.
Loose connection
Mostly happen on VGA chips, south birdges and the places close to CPU. Hard to troubleshoot and need lot experiences.
How to repair?
You need specialised tools. I have DC power supply which can display current change and set to different voltage and current output. You need Really nice soldering station, SMD rework station, BGA rework station, etc. I also have more than thousand schematic diagrams, all together about 10GB and you could not find anywhere in the net.
I have seen the video in youTub teach people how to fix VGA problem, and I guess you only have 30% chance if you follow it. My BGA rework station tutorial can perform up to 95% successful rate.
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Troubleshooting Dead HP G6000 Motherboard
Things that are likely worth solving:
Bad capacitors. Decently common and the parts only cost a few cents.
Most of the ICs on board... 4-20 pin jobbies such as the power ic do fail and are swappable for less than a buck or so
Blown fuses. Easy to diagnose easy to replace. This is a definite.
Any and all damaged jacks. Power and audio being the most commonly broken.
Resistors. easy to find easy to replace. cost is in pennies
Transistors and diodes can be more problematic to diagnose and fix but they too are cheap and swappable with just a soldering iron.
Obviously you can swap cpus so you should be able to diagnose that as well.
Case Study 1
"Machine: HP G6000(same mainboard as V6000)
Problem: Laptop will not power up, completely dead
Discription: The machine has been water damaged. It does not have system standby power, which are 3V and 5V.
Finding The Fault:
Check Max8724(the battery charging chip) first, because to make system has standby power this chip must work correctly. This is a 28 pin chip, we only need to test 1, 2, 4, 8, 10, 11 pin. They are VIN(main power for chip), LDO(provide 3.3V for chip itself in order to set REF voltage, also provide signal to drive 2 MOS to charge battery), REF(set reference voltage of the chip), SHDN#(enable/disable chip, a switch), ACIN(indicate the power supply has plugged in), ACOK#(power adaptor ok with mainboard).
Everything ok except 10 pin, ACIN is 0V. This is incorrect, mainboard doesn't detect there is an adaptor! Trace it backward and find it is very simple - mainboard use 2 resistors to pull the input voltage(19V, directly from dc socket) down to about 4V, so test the first resistor and find it opened. Change it and 3V/5V power come up and mainboard be able to switch on.
Then the trouble start when I try to charge the battery. The charging current never go beyond 0.15A and after 10 seconds the charging light start to flashing. Also can
